Preassembled lock of the unit type

ABSTRACT

A preassembled lock of the unit type is shown having a lock casing and latch-bolt and dead-bolt assemblies slidably mounted in the lock casing. Push lever means is centrically mounted within the lock casing on an axis normal to the direction of travel of the latch-bolt and dead-bolt assemblies. Bolt-moving lever means is eccentrically mounted with respect to the push lever means and operatively engages the dead-bolt assembly. Releasable blocking means retains the dead-bolt assembly in its locked position and rotation of the push lever means releases the blocking means and moves the bolt-moving lever means to thereby retract the dead-bolt assembly from its locked to its unlocked position. The rotation of the push lever means is over only a few degrees and can be accomplished in a fraction of a second. The dead-bolt assembly extends an appreciable distance out of the lock casing in its locked position, yet can be retracted in the aforementioned fraction of a second.

United States Patent 1191 Crepinsek Fehi 1974 [75] Inventor: Alois Crepinsek, San Jose, Calif.

[73] Assignee: Security Technology Corporation, San Jose, Calif.

22 Filed: Jan. 17,1972

21 Appl.No.: 218,365

[52] US. Cl. 70/110, 292/34 [51] Int. Cl. E051) 59/00 [58] Field of Search..... 70/107, 110, 416, 417, 423,

70/DlG. 3; 292/34 FOREIGN PATENTS OR APPLICATIONS 1,135,192 12/1968 Great Britain 70/417 Primary Examiner-Albert G. Craig, Jr.

Attorney, Agent, or FirmRobert W. Dilts, Esq.; Harry'G. Weissenberger, Esq.; Carlisle M. Moore,

Esq.

' [57] 7 ABSTRACT preassembled lock of the unit type is shown having a lock casing and latch-bolt and dead-bolt assemblies slidably mounted in the lock casing. Push lever means is centrically mounted within the lock casing on an axis normal to the direction of travel of the latch-bolt and dead-bolt assemblies. Bolt-moving lever means is eccentrically mounted with respect to the push lever means and operatively engages the dead-bolt assembly. Releasable blocking means retains the dead-bolt assembly in its locked position and rotation of the push lever means releases the blocking means and moves the bolt-moving lever means to thereby retract the dead-bolt assembly from its locked to its unlocked position. The rotation of the push lever means is over only a few degrees and can be accomplished in a fraction of a second. The dead-bolt assembly extends an appreciable distance out of the lock casing in its locked position, yet can be retracted in the aforementioned fraction of a second.

7 l6 Claims, ll Drawing Figures PATENTED FEB 51974 SHUT E U? 5 PAIENTED FEB 51974 3, 79 .633

II? I H7 PREASSEMBLED LOCK OF THE UNIT TYPE BACKGROUND OF THE INVENTIO 1. Field of the Invention The invention relates to locks; and, more particularly, to preassembled locks of the unit type.

2. Description of the Prior Art The latch-bolts of preassembled unit locks presently being sold on the market are usually limited to no more than about one-half inch in extended length. Such a relatively short latch-bolt extension may be easily pushed back to obtain unauthorized entrance therethrough. Further, mortise locks are also on the market which may be closed by a key and a dead-bolt. However, such locks are limited to a latch-bolt portion which is spaced from the dead-bolt portion. In order to close the deadbolt in the door for an extent of over 1 inch, the key must be turned two or three times over 360, which is very undesirable for security reasons, for example, in the case of a fire or the like. Further, these latter locks require a relatively long time for proper installation.

In summary, there is a need for a lock which cannot be opened from the outside even with the key itself or a master key. This is important in hotel rooms and similar places where one doesnt wish to be disturbed, or places where many identical keys are floating around. Such a lock should eliminate unnecessary features such as internal security chains, which require time to disengage in cases of emergency and sometimes can be forced from the outside. Finally, such a lock should have a handle which cannot be cut away or unscrewed from the outside.

SUMMARY OF THE INVENTION It is an object of this invention to provide a preassembled lock of the unit type which has a relatively long dead-bolt, yet such deadbolt may be fully extended by turning a key in the lock over only a few degrees.

It is a further object of this invention to provide such a lock wherein the handle may be turned from the inside only a few degrees to fully extend or retract both the latch-bolt and the dead-bolt in a fraction of a second.

It is a still further object of my invention to provide a lock whereby the door in which it is installed may be locked from the inside and cannot be opened from the outside even with the key itself or a master key.

It is an even further object of this invention to provide a lock whereby the handle cannot be cut away or unscrewed from the outside or entry forced therethrough.

It is a still further object to provide such a lock which can be quickly installed in doors of various thicknesses, e.g., from 1% inches to 3 inchesin thickness.

These and other objects are preferably accomplished by providing a preassembled lock of the unit type having a lock casing and latch-bolt and dead-bolt assemblies slidably mounted in the lock casing. Push lever means is centrically mounted within the lock casing on an axis normal to the direction of travel of the latchbolt and dead-bolt assemblies. Bolt-moving lever means is eccentrically mounted with respect to the push lever means and operatively engages the deadbolt assembly. Dog means retains the dead-bolt assembly in its lockedposition and rotation of the push lever means releases the blocking means and moves the boltmoving lever means to thereby retract the dead-bolt assembly from its locked to its unlocked position. The rotation of the push lever means is over only a few degrees and can be accomplished in a fraction of a second. The dead-bolt assembly extends an appreciable distance out of the lock casing in its locked position, yet can be retracted in the aforementioned fraction of a second.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of the preassembled lock of my invention;

FIG. 2 is a perspective view of the latch-bolt assembly of the lockof FIG. 1;

FIG. 3 is a perspective view of the dead-bolt assembly of the lock of FIG. 1;

F IG. 4 is an exploded perspective view of the internal operating mechanisms of the lock of FIG. 1;

FIG. 5 is a vertical sectional view of a portion of the lock of FIG. 1;

FIG. 6 is a side view in elevation of one of the push levers of my invention;

FIG. 7 is a perspective view of the'other push lever of my invention;

FIG. 8 is a vertical sectional view of the lock of my invention;

FIGS. 9 and 10 are vertical sectional views showing the working relationship of the parts of the inner mechanism of the lock of FIG. 1 movable between locked and unlocked positions; and

FIG. 11 is a partially exploded top view of the lock of my invention with the exterior knob portion shown in cross-section and the interior knob portion broken away.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1 of the drawing, a lock casing 10 is shown which is designed to be set into a door at the latching height. A latch-bolt 11 is shown mounted in casing 10 and a dead-bolt 12 surrounds latch-bolt 11. The latch bolt 11 and dead-bolt 12 are shown in detail in FIGS. 2 and 3, respectively.

As can be seen in FIG. 2, latch-bolt 11 includes a main latch portion 13 affixed to a latch frame 14. The connection between frame 14 and portion 13 is a matter of choice; frame 14 may include a tongue portion 15 which press-fits into a channel or groove 16 in latch portion 13. In this manner, main latch portion l3 can be installed on frame 14 in either a left or right orientation. Latch frame 14 includes a cut-out portion 17 for reasons to be discussed further hereinbelow. Latch frame 14 also includes a slotted portion 18 which terminates in upwardly extending flanges 19 and 20, respectively. Flange 19 carries a plate member 21 forming a T therewith at its upper end as shown. Flange 20 includes a reverse bent portion 22, both portion 22 and member 21 extending parallel to frame 14 as shown. Portion 22 and member 21 form latch protrusion 23.

Referring now to FIG. 3, dead-bolt 12 is generally U shaped as shown and is comprised of a pair of spaced elongated upper and lower plate members 24 and 25 interconnected by side wall 26. A bolt extension 27 is press-fitted or the like into a notch 28 in upper plate member 24. Bolt extension 27 includes a slot 29 therein and is generally T-shaped at end 30. A bolt-moving lever 31 including a slotted end 32 is disposed in slot 29 in bolt extension 27, a pin 33 or the like retaining end 32 therein for pivotal movement (i.e., pin 33 extends through the slot in slotted end 32 and suitable apertures in bolt extension 27). Lever 31 is configured as shown with a C-shaped intermediate portion 34 and a lower leg 35 having an aperture 36 therein for reasons to be discussed further hereinbelow.

In assembly of the dead bolt and latch-bolt mechanism, bolt-moving lever 31 is installed in slot 29 in bolt extension 27 and held therein by pin 33. Latch-bolt 11 of FIG. 2 is now placed within dead-bolt 12, i.e., between upper and lower plate members 24 and 25 and against side wall 26 as shown in FIG. 1. As can be seen in FIG. 1, the main latch portion 13 extends a short distance out of dead-bolt 12. Also, the bolt extension 27 extends between member 21 and bent portion 22 forming latch protrusion 23. The upper surfaces of plate member 24, bolt extension 27 and latch protrusion 23 may all be substantially flush as shown.

Lock casing 10, FIG. 1, is comprised of a rightand a left-hand steel case 37 and 38, respectively. These cases 37 and 38 can be seen in detail in FIG. 4. Lefthand steel case 38 includes a spring holder 39 inserted in a slot 40 in the wall thereof and extending into the interior of casing 10. Holder 39 can also be seen in FIG. 2 and includes a spring 41 disposed between holder 39 and a cavity 42 formed in the rear portion of the main latch portion 13 of latch-bolt 11. Left-hand steel case 38 also includes upper and lower spaced end bars 43 and 44, respectively, between which dead-bolt 12 is retained and adapted to slide therebetween. The relationship of bolt-moving lever 31 is shown in dotted lines in FIG. 2; that is, it extends between slotted portion 18 of the latch frame 14 when assembled.

As shown in FIGS. 4 and 5, a three-piece axle 45 is shown. The axle 45, FIG, 5, is comprised of sleeve piece 46 which fits over an intermediate or middle piece 47 and an abutting inner piece 48. A V-shaped push lever 49 is preferably comprised of two parts, 490 and 49b (FIG. 6) with suitable keyed apertures in each. The aperture in part 49a keys onto the notch 46a on sleeve piece 46 (FIG. 4). The aperture in part 49b keys onto the notch 48a in inner piece 48. The completed assembly is shown in FIG. 5. A second V-shaped push lever 50 is of a unitary configuration (FIG. 7) and includes an aperture into which an axle portion 85 is inserted. As can be seen, the outer end of axle portion 85 is notched as shown for receiving a ward 860, as will be explained further hereinbelow. The completed arrangement of lever 50 on axle portion 85 can also be seen in FIGS. 8 and 11.

Referring now to FIGS. 9 and 10, push lever 49 is shown as centrically mounted in lock casing 10. This is accomplished by a centric hole in lock casing 10. This centric hole can be best seen by comparing apertures 51 and 52 (FIG. 4) in rightand left-hand steel cases 37 and 38, respectively. That is, push button axle 86 (FIGS. 5, 9 and extends centrically between cases 37 and 38. The function of axle 86 will be explained further hereinbelow. The second push lever 50 is disposed on the other side of lever 49 with bolt-moving lever 31 disposed therebetween. This is clearly shown in FIG. 11 but is more clearly understood by reference to FIGS. 9 and 10 wherein only push lever 49 is visible. As can be seen in FIGS. 9 and 10, bolt-moving lever 31 is eccentrically mounted with respect to push levers 49 and 50, the C-shaped intermediate portion 34 thereof surrounding axle 45 in FIG. 9.

A pair of latch-moving levers 53 and 54 are also eccentrically mounted with respect to push levers 49, 50 (only left-hand lever 53 being visible in FIGS. 9 and 10 both levers 53 and 54 being shown in FIGS. 2 and 4). A suitable pin 55 (FIGS. 4, 9 and 10) extends through suitable apertures 56 in levers 53 and 54 and the aforementioned aperture 36 in bolt-moving lever 31. Various types of spacers and bushing may be preferably disposed between the latch-moving levers 53 and 54 and bolt-moving lever 31. For example, spacers 57 (FIG. 4) may be provided on pin 55. Centering bushings 570, having a mating portion 57b, may also be provided between the various levers. The second V- shaped push lever 50 (not visible in FIGS. 9 and 10) is installed after the latch-moving lever 53, spacer 57 and bolt-moving lever 31. The right-hand latch-moving lever 54 is then installed on the eccentric axis (indicated by pin 55, FIGS. 9 and 10).

A slotted dog 58 is then installed before the rear end of bolt 12 and is spring-biased by means of spring 59, as shown. That is, suitable channels 60 and 61 (FIG. 9) are formed in the walls of bolt extension 27 and case 37, respectively, for receiving dog 58 and spring 59 therein. As can be seen by comparing FIGS. 9 and 10, V-shaped push lever 49 includes an extension portion 62 which enters the slot of dog 58 as shown to thereby move dog 58 to unblock the dead-bolt 12 when activated, as will be discussed further hereinbelow.

A rear dog 63 is provided to also block dead-bolt 12. Dog 63 is generally T-shaped in side view and includes a head portion 64 extending into a channel 65 formed in the rear wall 66 of lock casing 10. Channel 65 is tapered along one side as shown. The tail portion 67 of dog 63 is spring-biased by means of a spring 68 fixedly mounted in a channel or groove 69 in rear wall 66. Tail portion 67 includes a shoulder or lip portion 70 thereon adapted to engage a second extension portion 71 (FIG. 10) on push lever 49 when activated as shown. Head portion 64 is slotted (see FIG. 11) so that end 32 of bolt-moving lever 31 may pivot therebetween. When bolt extension 27 is moved forwardly as shown in FIG. 10, it unblocks and releases dog 63 which thereby blocks the re-engagement (or retraction) of dead-bolt 12 so it cannot be forced and pushed back. To release the blocking rear blocking dog 63 to thus return deadbolt 12 to its initial position, extension portion 71 of push lever 49 must be moved into engagement with the shoulder or lip portion 70 until dog 63 no longer blocks the retraction of dead-bolt 12.

The right-hand steel case 37 is used to complete lock casing 10 and hold all the internal components therein. When this is accomplished, as shown in FIG. 1, knob sleeves 72 having radial arms 73 interconnected thereto are connected to push button axle 86. The arms 73 have arcuate slots 74 for receiving like protrusions 75 on sleeves 72. Relatively heavy springs 76, having one end 77 fixed in a groove 78 in arm 73 and the other end 79 shouldered to snap-fit under a protrusion 80 on right-hand steel case 37, are provided to hold the handle or knob in perfect balance. A pin 81 preferably extends through a suitable aperture in arm 73 to hold arm 73 between limits of an arcuate slot 82 in right-hand steel case 37. Slot 82 can also be seen in FIGS. 9 and 10.

A conventional cylinder lock 83 is connected to one of the sleeves 72 and may have a freely rotatable sleeve or tubing 84 (FIG. 8) disposed between cylinder lock 83 and sleeve 72 to prevent cutting of the door handle. That is, the tubing 84 will rotate if one attempted to cut through the door handle.

Referring back to FIG. 1, a cover plate 87 is placed over the bolt and latch assemblies. Screws may be used to secure plate 87 via apertures 88 to apertures 89 in end bars 43 and 44. One or more spacing plates 90 or the like may be used to build up the overall width of lock casing 10, depending on the thickness of the door into which it is to be installed. For example, a conventional door plate 91 may be provided having suitable integral screws 92, which screws are inserted through apertures 93 in casing and into suitable mating threaded sleeves 94 on a mating door plate 95 to secure the entire arrangement together. As can be seen, member 21 and portion 22 are guided within slots 96 and 97 in rightand left-hand steel cases 37 and 38, respectively.

Referring back again to FIG. 5, a retaining element 98 (see also FIG. 4) fits into an arcuate slot 99 on the left-hand knob sleeve 72 and then through slot 100 in sleeve portion 46 of axle 45 and into groove 101 of middle piece 47. An identical arrangement is on the right-hand knob sleeve 72. Also, the push button axle 86 includes push button 102 at its outer end (see FIG. 8). A rotary button'103 surrounds button 102. Rotary button 103 is connected to middle piece 47 of axle 45, which in turn moves push lever 49. A retainer 104 keys rotary button 103 to middle piece 47; a wire 105 or the like holds retainer 104 in position. A retainer 106 (FIG. 5) slides in a slot 107 in sleeve piece 46 of axle 45.

The interior door knob or handle 108 (FIG. 5) has an integral element 109 which is adapted to engage a like element 110 which includes a slot 111 retaining spring 112 therein and is movable within the space 113 within hollow handle 108. It is noted that the term door knob is used in a broad sense to refer to any suitable type of door handle or the like. A spring 1 14 is disposed between the end of axle 45 and the push button 102. At the exterior door knob or handle 115, akey 116 is shown inserted into cylinder lock 83 (FIG. 8).

In operation, the lock of my invention is installed in a convenient door or the like. The elements are as shown in FIG. 8 with key 116 being inserted therein. This is from the outside of the door. The push button 102 is shown in the IN position (.the bolt 12 being in the FIG. 10 position). Since ward 86a blocks one or more of the cylinder lock elements, the cylinder lock 83 cannot be opened or released even with the change-key itself or any other keys, picks, elements, etc. To release the ward mechanism so a conventional key can be used again, the inside door handle 108 is turned only a few degrees, for example, l0-15 or so, which in a fraction of a second retracts both the dead-bolt l2 and latchbolt 11. This is accomplished by screw 106a keying handle 108 to sleeve 72 whereby retainer 106 is keyed in slot 107 of sleeve piece 46. Sleeve .piece 46 is in engagement with push lever 49 (the FIG. 10 position) and movement thereof moves push lever .49 to the FIG. 9 position which releases rear dog 63 to thereby release dead-bolt 12. That is, lever 49 moves clockwise (FIG. 10) and engages lip portion 71 to release dog 63 whereby protrusion 117 engages the lower leg 35 of bolt-moving lever 31 which, as can be seen in FIG. 3, also moves bolt extension 27 and thus dead-bolt 12 to the FIG. 9 position. Push button 102 is automatically released by disengagement of element 109 with element 110. This moves ward 86a out of blocking engagement with the cylinderlock 83.

The dead-bolt 12 can be moved a relatively great distance (FIG. 10) in a fraction of a second by means of the eccentric mounting of bolt-moving lever 31 and the eccentric movement of push levers 49, 50.

After the operator leaves the house, he now desires to lock the door. Using his key, with only a few degrees of rotation he extends the dead-bolt over a considerable distance, e.g., 2 inches or so, into the door jamb. He removes his key and the thickness of side wall 26 of dead-bolt 12, which is exposed to the outside, i.e., between the door and door jamb, prevents an intruder from using tools or the like to jimmy the lock.

The outside door handle 115 cannot be rotated, i.e., it is blocked. This is accomplished by rear dog 63 blocking retraction of dead-bolt 12 and the latch protrusion 23 being forward of T-shaped end 30 and thus blocking latch-bolt 11.

When the owner returns, he uses his proper key 116 to open the door with a mere few degrees rotation in a fraction of a second. Rotation of key 116, which is connected to axle portion (FIG. 8) via ward 86a and the conventional cylinder lock mechanism 83 (see FIG. 11) rotates push lever 50. Rotation of push lever 50 (FIG. 7) moves protrusion 118 thereon into engagement with latch-moving lever 54, whereas protrusion 119 thereon engages leg 35 of bolt-moving lever 31. The door is now opened by further rotation of push lever 50 and the operator enters the room.

Once inside the room, the operator can lock the door, i.e., extend the dead-bolt 12, by moving rotary button 103 which in turn rotates middle piece 47 of axle 45 to rotate push lever 49. This moves lever 49 counterclockwise (FIG. 9), which releases dog 58 to release dead-bolt 12 and move it to the FIG. 10 position. The door is now locked from the inside but anyone having the proper key can enter. In order to prevent this, the push button 102, connected by axle 86 to ward 86a (see FIG. 8), is pushed to block the cylinder lock 83 as discussed hereinabove. Now no one, even with the change key, can enter. No chains or other external bolts or the like are necessary.

In case of fire inside the room, the handle or knob 108 need be rotated only a few degrees and all the internal blocking mechanisms previously described are released in a fraction of a second.

The lock of my invention is completely preassembled for all types of door thicknesses, e.g., from 1% to 3 inches. This is accomplished by the spacer plates previously described.

I claim as my invention:

1. A preassembled lock of the unit type comprising:

a lock casing comprising a pair of spaced side walls,

a connecting end wall and an open front wall;

a dead-bolt assembly disposed within said casing in sliding engagement therewith adapted to extend through said open front wall when in locking position and to retract into said lock casing in unlocking position, said dead-bolt assembly including upper and lower spaced plate members connected by a side wall;

a spring-biased latch-bolt assembly slidably mounted within said dead-bolt assembly between said upper and lower plate members against said side wall of said dead-bolt assembly and adapted to normally protrude out said open front wall, said side wall and said upper and lower plate members of said deadbolt assembly shielding said protruding latch-bolt assembly when said dead-bolt assembly is in its locking position; push lever means centrically mounted within said lock casing on an axis normal to the direction of travel of said latch-bolt and dead-bolt assemblies;

dead-bolt-moving lever means eccentrically mounted within said lock casing on an axis normal to the direction of travel of said latch-bolt and dead-bolt assemblies and spaced from said centric axis, said dead-bolt-moving lever means being adapted to operatively engage said dead-bolt assembly to thereby move said dead-bolt assembly from its locking position to its unlocking position; and

dog means mounted in said lock casing for retaining said dead-bolt assembly in its locking position, said push lever means being adapted to operatively engage both said dead-bolt-moving lever means and said dog means for selectively releasing said dog means and then actuating said dead-bolt-moving lever means to move said dead-bolt assembly from its locking to its unlocking position.

2. The lock of claim 1 wherein said dead-bolt assembly further includes a bolt extension removably secured to said upper plate member at the rear thereof, said bolt extension having a slot therein with one end ofsaid dead-bolt-moving lever means extending within said slot and pivotally mounted for pivotal movement therein, the movement of said dead-bolt-moving lever means thereby moving said dead-bolt assembly.

3. The lock of claim 2 wherein said dog means includes a first spring-biased blocking lever mounted within said lock casing, said blocking lever having an opening therein and movable between a first position holding said dead-bolt assembly in its unlocking position to a second position releasing said dead-bolt assembly for movement to its locking position, said push lever means including a portion extending into the opening in said blocking lever and adapted to move said blocking lever between its first and second positions upon rotation of said push lever means.

4. The lock of claim 3 wherein said dog means includes a second spring-biased blocking lever mounted within said lock casing, said second blocking lever being movable between a first position blocking said dead-bolt assembly from movement into its unlocking position to a second position releasing said dead-bolt assembly for movement into its locking position, said second blocking lever including a portion thereon adapted to be engaged by a second portion on said push lever means whereby said second blocking lever is moved between its first and second positions upon engagement of the portion of said second blocking lever by said second portion of said push lever means.

5. The lock ofclaim 4, wherein said latch-bolt assembly includes a main latch portion removably secured to a latch frame, said latch frame including a rear slotted portion for receiving therein the end. of said dead-boltmoving lever means which is pivotally connected to said dead-bolt assembly, the pivotal connection of said dead-bolt-moving lever means to said bolt extension being above said slotted portion, said latch frame including upwardly and inwardly extending spaced flanges forming a latch protrusion thereon, said bolt extension including a T-shaped end with the leg of said T-shaped end being slidable between said flanges with the flanges disposed between the head of said T-shaped end and the connection of said bolt extension to said upper plate member.

6. The lock of claim 5 wherein said spaced flanges are guided within elongated slots formed in the respective side walls of said lock casing.

7. The lock of claim 1 wherein a pair of door knob sleeves are operatively connected to opposite ends of an axle extending concentrically through said lock casing on opposite sides thereof, said axle operatively engaging said push lever means and at least one sleeve having a door knob and a cylinder lock associated therewith and including a freely rotatable inner sleeve member disposed between the interior of said door knob and the outer surface of said cylinder lock.

8. The lock of claim 1 whereby a pair of door knob sleeves are operatively connected to opposite ends of an axle extending concentrically through said lock casing on opposite sides thereof, said axle operatively engaging said push lever means and at least one sleeve member having a door knob and a cylinder lock with a plurality of elements associated therewith, said lock further including a blind key disposed within said lastmentioned knob sleeve and selectively movable between a first position blocking at least some of the elements of said cylinder lock and a second position unblocking said elements.

9. The lock of claim 8 wherein said axle is springbiased and includes a push button at the end thereof with said other sleeve member mounted thereon, said latter end also including a door knob operatively engaging said axle to hold said axle in a first position whereby said blind key blocks said elements and release said axle to a second position whereby said blind key unblocks said elements.

10. The lock of claim 1 wherein said push lever means includes at least a pair of push levers, said first push lever including protrusions thereon for engaging said dead-bolt-moving lever means and further including means thereon for engaging said dog means, said second push lever also including protrusions thereon, said latter protrusions comprising a pair of oppositely extending protrusions extending in a direction normal to the plane of rotary movement of said second push lever, the first of said opposite extending protrusions being adapted to operatively engage a latch-moving lever operatively connected to said latch-bolt assembly to move said latch-bolt assembly to a position retracted within said lock casing and the second of said oppositely extending protrusions being adapted to operatively engage said dead-bolt moving lever means.

11. The lock of claim 10 wherein said lock further includes a rotatable button operatively connected to said first push lever for moving said first push lever in a counterclockwise direction, the rotation of said first push lever in said counterclockwise direction being adapted to release said dog means to move said deadbolt to its fully extended position.

12. The lock of claim 11 wherein a pair of door knob sleeves are operatively connected to opposite ends of an axle extending concentrically through said lock casing on opposite sides thereof, said axle operatively engaging both of said push levers and at least one sleeve member having a door knob and a cylinder lock with a plurality of elements associated therewith, said lock further including a ward disposed within said lastmentioned knob sleeve and selectively movable between a first position blocking at least some of the elements of said cylinder lock and a second position unblocking said elements,-said axle being spring-biased and further including a push button at the end thereof with said other sleeve member mounted thereon, said latter end also including a door knob operatively engaging said axle to hold said axle in a first position whereby said ward blocks said element, and release said axle to a second position whereby said ward unblocks said elements.

13. The lock of claim 1 including a front cover plate associated with said lock casing, said plate having an opening therein through which said dead-bolt and latch-bolt assemblies extend and being removably secured to at least a pair of spaced end bars associated with said lock casing, one of said end bars being at the top of said lock casing and the other at the bottom thereof with said bolt assembly slidable between said spaced end bars.

14. The lock of claim 13 including spacer plate means removably secured to said lock casing for in- 1% creasing the width of said lock casing.

15. The lock of claim 1 wherein said dead-boltmoving lever means includes a lever having a slotted end extending through a slot formed in said dead-bolt assembly and pivotally movable therein, an intermediate C-shaped portion connected to said slotted end and surrounding said concentric axis and a lower leg connected to said C-shaped portion eccentrically mounted on said eccentric axis.

16. The lock of claim 1 wherein a pair of door knob sleeves are operatively connected to opposite ends of an axle extending concentrically through said lock casing on opposite sides thereof, said axle operatively engaging said push lever means and each of said sleeves having a spring-biased radial arm associated therewith, both of said arms operatively connected to said knob sleeves and movable therewith, and both of said arms including protrusions thereon movable within arcuate slots formed in the side walls of said lock casin g for limiting the rotation thereof. 

1. A preassembled lock of the unit type comprising: a lock casing comprising a pair of spaced side walls, a connecting end wall and an open front wall; a dead-bolt assembly disposed within said casing in sliding engagement therewith adapted to extend through said open front wall when in locking position and to retract into said lock casing in unlocking position, said dead-bolt assembly including upper and lower spaced plate members connected by a side wall; a spring-biased latch-bolt assembly slidably mounted within said dead-bolt assembly between said upper and lower plate members against said side wall of said dead-bolt assembly and adapted to normally protrude out said open front wall, said side wall and said upper and lower plate members of said dead-bolt assembly shielding said protruding latch-bolt assembly when said dead-bolt assembly is in its locking position; push lever means centrically mounted within said lock casing on an axis normal to the direction of travel of said latch-bolt and dead-bolt assemblies; dead-bolt-moving lever means eccentrically mounted within said lock casing on an axis normal to the direction of travel of said latch-bolt and dead-bolt assemblies and spaced from said centric axis, said dead-bolt-moving lever means being adapted to operatively engage said dead-bolt assembly to thereby move said dead-bolt assembly from its locking position to its unlocking position; and dog means mounted in said lock casing for retaining said deadbolt assembly in its locking position, said push lever means being adapted to operatively engage both said dead-bolt-moving lever means and said dog means for selectively releasing said dog means and then actuating said dead-bolt-moving lever means to move said dead-bolt assembly from its locking to its unlocking position.
 2. The lock of claim 1 wherein said dead-bolt assembly further includes a bolt extension removably secured to said upper plate member at the rear thereof, said bolt extension having a slot therein with one end of said dead-bolt-moving lever means extending within said slot and pivotally mounted for pivotal movement therein, the movement of said dead-bolt-moving lever means thereby moving said dead-bolt assembly.
 3. The lock of claim 2 wherein said dog means includes a first spring-biased blocking lever mounted within said lock casing, said blocking lever having an opening therein and movable between a first position holding said dead-bolt assembly in its unlocking position to a second position rEleasing said dead-bolt assembly for movement to its locking position, said push lever means including a portion extending into the opening in said blocking lever and adapted to move said blocking lever between its first and second positions upon rotation of said push lever means.
 4. The lock of claim 3 wherein said dog means includes a second spring-biased blocking lever mounted within said lock casing, said second blocking lever being movable between a first position blocking said dead-bolt assembly from movement into its unlocking position to a second position releasing said dead-bolt assembly for movement into its locking position, said second blocking lever including a portion thereon adapted to be engaged by a second portion on said push lever means whereby said second blocking lever is moved between its first and second positions upon engagement of the portion of said second blocking lever by said second portion of said push lever means.
 5. The lock of claim 4, wherein said latch-bolt assembly includes a main latch portion removably secured to a latch frame, said latch frame including a rear slotted portion for receiving therein the end of said dead-bolt-moving lever means which is pivotally connected to said dead-bolt assembly, the pivotal connection of said dead-bolt-moving lever means to said bolt extension being above said slotted portion, said latch frame including upwardly and inwardly extending spaced flanges forming a latch protrusion thereon, said bolt extension including a T-shaped end with the leg of said T-shaped end being slidable between said flanges with the flanges disposed between the head of said T-shaped end and the connection of said bolt extension to said upper plate member.
 6. The lock of claim 5 wherein said spaced flanges are guided within elongated slots formed in the respective side walls of said lock casing.
 7. The lock of claim 1 wherein a pair of door knob sleeves are operatively connected to opposite ends of an axle extending concentrically through said lock casing on opposite sides thereof, said axle operatively engaging said push lever means and at least one sleeve having a door knob and a cylinder lock associated therewith and including a freely rotatable inner sleeve member disposed between the interior of said door knob and the outer surface of said cylinder lock.
 8. The lock of claim 1 whereby a pair of door knob sleeves are operatively connected to opposite ends of an axle extending concentrically through said lock casing on opposite sides thereof, said axle operatively engaging said push lever means and at least one sleeve member having a door knob and a cylinder lock with a plurality of elements associated therewith, said lock further including a blind key disposed within said last-mentioned knob sleeve and selectively movable between a first position blocking at least some of the elements of said cylinder lock and a second position unblocking said elements.
 9. The lock of claim 8 wherein said axle is spring-biased and includes a push button at the end thereof with said other sleeve member mounted thereon, said latter end also including a door knob operatively engaging said axle to hold said axle in a first position whereby said blind key blocks said elements and release said axle to a second position whereby said blind key unblocks said elements.
 10. The lock of claim 1 wherein said push lever means includes at least a pair of push levers, said first push lever including protrusions thereon for engaging said dead-bolt-moving lever means and further including means thereon for engaging said dog means, said second push lever also including protrusions thereon, said latter protrusions comprising a pair of oppositely extending protrusions extending in a direction normal to the plane of rotary movement of said second push lever, the first of said opposite extending protrusions being adapted to operatively engage a latch-moving lever operatively connected to said latch-bolt assembly to move said latch-bolt aSsembly to a position retracted within said lock casing and the second of said oppositely extending protrusions being adapted to operatively engage said dead-bolt moving lever means.
 11. The lock of claim 10 wherein said lock further includes a rotatable button operatively connected to said first push lever for moving said first push lever in a counterclockwise direction, the rotation of said first push lever in said counterclockwise direction being adapted to release said dog means to move said dead-bolt to its fully extended position.
 12. The lock of claim 11 wherein a pair of door knob sleeves are operatively connected to opposite ends of an axle extending concentrically through said lock casing on opposite sides thereof, said axle operatively engaging both of said push levers and at least one sleeve member having a door knob and a cylinder lock with a plurality of elements associated therewith, said lock further including a ward disposed within said last-mentioned knob sleeve and selectively movable between a first position blocking at least some of the elements of said cylinder lock and a second position unblocking said elements, said axle being spring-biased and further including a push button at the end thereof with said other sleeve member mounted thereon, said latter end also including a door knob operatively engaging said axle to hold said axle in a first position whereby said ward blocks said element, and release said axle to a second position whereby said ward unblocks said elements.
 13. The lock of claim 1 including a front cover plate associated with said lock casing, said plate having an opening therein through which said dead-bolt and latch-bolt assemblies extend and being removably secured to at least a pair of spaced end bars associated with said lock casing, one of said end bars being at the top of said lock casing and the other at the bottom thereof with said bolt assembly slidable between said spaced end bars.
 14. The lock of claim 13 including spacer plate means removably secured to said lock casing for increasing the width of said lock casing.
 15. The lock of claim 1 wherein said dead-bolt-moving lever means includes a lever having a slotted end extending through a slot formed in said dead-bolt assembly and pivotally movable therein, an intermediate C-shaped portion connected to said slotted end and surrounding said concentric axis and a lower leg connected to said C-shaped portion eccentrically mounted on said eccentric axis.
 16. The lock of claim 1 wherein a pair of door knob sleeves are operatively connected to opposite ends of an axle extending concentrically through said lock casing on opposite sides thereof, said axle operatively engaging said push lever means and each of said sleeves having a spring-biased radial arm associated therewith, both of said arms operatively connected to said knob sleeves and movable therewith, and both of said arms including protrusions thereon movable within arcuate slots formed in the side walls of said lock casing for limiting the rotation thereof. 